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TAP1 a 'transporter associated with antigen processing' (TAP) protein. Member of the ATP binding cassette (ABC) family of transmembrane transporters. Also acts as a molecular scaffold for the final stage of MHC class I folding, namely the binding of peptide. Nascent MHC class I molecules associate with TAP via tapasin. Inhibited by the covalent attachment of herpes simplex virus ICP47 protein, which blocks the peptide-binding site of TAP. Inhibited by human cytomegalovirus US6 glycoprotein, which binds to the lumenal side of the TAP complex and inhibits peptide translocation by specifically blocking ATP-binding to TAP1 and prevents the conformational rearrangement of TAP induced by peptide binding. Inhibited by human adenovirus E3-19K glycoprotein, which binds the TAP complex and acts as a tapasin inhibitor, preventing MHC class I/TAP association. Expression of TAP1 is down-regulated by human Epstein-Barr virus vIL-10 protein, thereby affecting the transport of peptides into the endoplasmic reticulum and subsequent peptide loading by MHC class I molecules. Defects in TAP1 are a cause of bare lymphocyte syndrome. Note: This description may include information from UniProtKB.
Protein type: Membrane protein, integral; Membrane protein, multi-pass; Transporter
Chromosomal Location of Human Ortholog: 6p21.32
Cellular Component: endoplasmic reticulum; endoplasmic reticulum membrane; ER-Golgi intermediate compartment membrane; integral to endoplasmic reticulum membrane; integral to membrane; membrane; microtubule organizing center; phagocytic vesicle membrane; TAP complex
Molecular Function: ADP binding; ATP binding; peptide transporter activity; protein binding; protein homodimerization activity; TAP1 binding; TAP2 binding
Biological Process: antigen processing and presentation of endogenous peptide antigen via MHC class I; antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent; antigen processing and presentation of peptide antigen via MHC class I; cytosol to ER transport; peptide transport
Disease: Bare Lymphocyte Syndrome, Type I
Reference #:  Q03518 (UniProtKB)
Alt. Names/Synonyms: ABC transporter, MHC 1; ABC17; ABCB2; Antigen peptide transporter 1; APT1; ATP-binding cassette sub-family B member 2; ATP-binding cassette, sub-family B (MDR/TAP), member 2; D6S114E; FLJ26666; FLJ41500; Peptide supply factor 1; Peptide transporter involved in antigen processing 1; Peptide transporter PSF1; Peptide transporter TAP1; PSF-1; PSF1; Really interesting new gene 4 protein; RING4; TAP1; TAP1*0102N; TAP1N; transporter 1, ATP-binding cassette, sub-family B; transporter 1, ATP-binding cassette, sub-family B (MDR/TAP); transporter associated with antigen processing; transporter, ATP-binding cassette, major histocompatibility complex, 1; Y3
Gene Symbols: TAP1
Molecular weight: 87,218 Da
Basal Isoelectric point: 8.24  Predict pI for various phosphorylation states
Protein-Specific Antibodies or siRNAs from Cell Signaling Technology® Total Proteins
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